I just looked under our 2006 19' foot...the only lines exposed on the outside of the belly pan are gas lines...and in the rear curbside quarter (behind the axle) the gas line to the water heater and fridge is a copper line is inside of a plastic tube, presumabley to act as sheathing to protect the gas line. Gas lines are typically run on the outside because they are safer there in the event a leak should develop. The only color lines I am aware of are red (hot) and white (cold) water...and those are all interior, of course.
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TB & Greg and Abbey Schnauzer
AirForums #21900
PastPrez, 4CU/WBCCI
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